The error in your log is:
Setting up shim-signed (1.34.9+13-0ubuntu2) ...
Installing for x86_64-efi platform.
Could not delete variable: Interrupted system call
grub-install: error: efibootmgr failed to register the boot entry: Block device 
required.
dpkg: error processing package shim-signed (--configure):
 installed shim-signed package post-installation script subprocess returned 
error exit status 1

It appears that there is a problem with your firmware that prevents shim
from uploading the bootloader configuration variables.  Is it possible
that you are affected by
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1734147 ?

** Changed in: shim-signed (Ubuntu)
       Status: New => Incomplete

** Summary changed:

- package shim-signed 1.34.9+13-0ubuntu2 failed to install/upgrade: installed 
shim-signed package post-installation script subprocess returned error exit 
status 1
+ Could not delete variable: Interrupted system call (package shim-signed 
1.34.9+13-0ubuntu2 failed to install/upgrade: installed shim-signed package 
post-installation script subprocess returned error exit status 1)

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https://bugs.launchpad.net/bugs/1767761

Title:
  Could not delete variable: Interrupted system call (package shim-
  signed 1.34.9+13-0ubuntu2 failed to install/upgrade: installed shim-
  signed package post-installation script subprocess returned error exit
  status 1)

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